One of the world’s most profitable crypto mines is in Joburg

Running off almost free electricity generated by sunlight.
Banks of graphics cards solve complex mathematical puzzles at the Libertas crypto mine in Rivonia. Image: Supplied

Whirring away in the bowels of an office block in northern Johannesburg is a crypto mine that is rated among the most profitable in the world.

Banks of graphics cards, powered by solar panels positioned on the roof above, solve complex mathematical puzzles and get rewarded in a currency known as Transaction Service Fee or TSF. TSF is the currency used to transact on the Transaction Service Fee blockchain, and is currently valued at about $0.24, which is up about five-fold over the last nine months.

The rising TSF price has attracted crypto ‘miners’ from around the world eager to jump aboard one of the most profitable mining ventures in the world.

Crypto mining has become a massive global business, with its own economy made up of mining ‘rig’ suppliers, developers and the miners themselves.

Why Joburg?

Earlier this year, China banned crypto mining and that drove miners to more congenial locales with relatively cheap electricity like Texas in the US, and Kazakhstan.

South Africa, with its notorious power grid problems, does not feature on the list of most favoured nations for crypto mining.

Which makes the TSF crypto mine all the more interesting. As crypto prices rise and fall, miners shift their attention to the next gold rush and recalibrate their equipment to the most profitable mining ventures available. And that has put TSF on the global crypto map.

The crypto mine is owned by a blockchain company called Libertas, which is part of a global revolution focusing on smart contracts and blockchain technologies that enable business transactions without the need for agents such as lawyers and banks. For example, wills, insurance contracts and financial contracts can be written in computer code and executed without any dispute or delay.

“It might be strange to some people that we are doing crypto mining from an office park in Rivonia, and doing it profitably, but you need solar panels to do this effectively,” says Libertas chief operations officer Dragan Vidakovic.

The solar panels generate 3.34 kilowatts of power, which is sufficient to power the crypto mine – which produces 1 gigashash (or 1 billion ‘hashes’ or puzzles) per second – and supply the electricity needs of the Libertas office, including lights, computers, air conditioning and other appliances.

The solar set-up generates enough energy to power the crypto mine and meet the electricity needs of the Libertas office. Image: Supplied

A second and much larger 15 gigahash crypto mine is located in Bosnia-Herzegovina in Europe, powered by hydro-electricity.

Both mines are generating TSF coins to finance payments and transactions on the TSF blockchain. Clients are required to purchase TSF ‘tokens’ or coins in order to transact on the blockchain, and this creates constant demand for the coins.

While scores of miners around the world have set up mining operations to profit from the TSF coins, Libertas itself accounts for the bulk of mining activity.

Surplus energy generated by the solar panels is stored in batteries, which keep the mining rigs going during the night hours, with the Eskom grid kicking in for between two and four hours a day, depending on the quality of sunshine during the daylight hours.

The Joburg farm yields about 30 coins an hour, with the Bosnian operation doing 15 times this amount.

“Here in Joburg we have about 12 kilowatts available from the solar panels, and we are only using around half of that, so we have capacity to expand the mining operation – which we will do as demand for the coins increases,” says Asif Aziz, chief technology officer at Libertas.

TSF coins

Demand for TSF coins comes from business customers such as insurance companies looking to remove human agents from their business operations and execute smart contracts based entirely on computer code.

All sorts of business processes are being transferred to the blockchain.

Take the subject of wills, for example. These rely on intermediaries such as lawyers and financial consultants to draft the wills and then interpret them when it comes time to distribute the estate of the deceased person. A far simpler method is to write the conditions of the will into computer code in the form of a smart contract that cannot be altered or disputed later.

Read: ‘The future is crypto’

Demand for TSF coins also comes from those interested in issuing NFTs or non-fungible tokens, which is creating a massive new economy around electronic property rights.

Listen to Simon Brown’s interview with Revix founder Sean Sanders in this MoneywebNOW podcast (or read the transcript here):



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I still don’t understand how this works? Why can’t we all mine with the right equipment and power source?

Crypto-mining is an arbitrage strategy. It buys electricity and sells crypto. The operation shuts down when the price of a coin is lower than the cost of the electricity that is required to produce the coin. Some operations are subsidizing the purchasers of crypto because they are producing at a loss. Like with all commodity producers, eventually, the producer with the lowest marginal cost of production will be the only survivor.

If the facts in this article are true, then local sun and wind farms should be the lowest-cost producers on earth because they have the scale benefits.

I still don’t understand… need facts and figures

I think they meant about 12kWh per day from solar. At 30 ‘coins’ per hour the energy cost for this coin transaction is very low compared to bitcoin transactions which is supposed to be about 1800 kWh per transaction. (VISA transactions require about a millionth as much per transaction!)

A new bitcoin is about 150,000 kWh, still ‘cheap’ compared to its R1m ‘value’

End of comments.


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